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Date Posted: 10:13:53 08/02/02 Fri
Author: Michel
Subject: Re: Working with TIFF
In reply to: glup 's message, "Working with TIFF" on 11:15:32 07/23/02 Tue


Hi Glup,

You cannot modify an individual image within a multipage tiff file. You need to recreate another file, and use AppendToStream after the first call to SaveToStream, then rename the file.

Some tiff formats are not supported. I also don't have a complete tiff image suite as there are many variations. I think CMYK and YCbCr will open fine (if they are not compressed with LZW). The alpha channel will be ignored when opening a file.

Tiled files can be read, but Envision will not saved in tiled format.

Best regards,

Michel
>How do I save a complete TIFF, where one page have
>been modified?
>
>for wPage := 1 to wTif.FrameCount do begin
> wTif.CurrentFrame := wPage;
> wTif.AppendToStream( aStream );
>end;
>
>Saves only the last page! aStream is a TFileStream.
>After each page do Position and Size of the stream not
>change.
>
>
>I want to move pages from one TIFF to another.
>How could I insert or delete a page without having to
>work with a stream when I use allready MultiLoad :=
>true?
>
>
>I do not have sample files, but what will happen when
>opening
>* a CMYK TIFF (PhotometricInterpretation = 5)
>* a YCbCr TIFF (PhotometricInterpretation = 6)
>* a TIFF with alpha channel
>* a tiled TIFF
>
>
>How could I write a tiled TIFF?
>How address tiles?
>
>Rgds
>
>glup

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